Stamp-mill.



No. 728,999. PATENTED MAY 26, 1903. J. A. & J. W. SHIELDS.

STAMP MILL.

APPLICATION FILED NOV. 10. 1902.

no MODEL. 3 SHEETS-SHEET 1 No. 728.999. 4 PATENTED MAY 26,1903.

' J. A. & J. W. SHIELDS.

STAMP MILL.

APPLICATION FILED NOV. 10. m2.

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UNITED STATES Patented May 26, 1903.

PATENT ()FFICE.

JOSEPH A. SHIELDS AND JAMES W. SHIELDS, 0F LAKE LINDEN, MICHIGAN.

STAMP-MILL.

SPECIFICATION forming part Of Letters Patent NO. 728,999, dated May 26, 1903. Application filed November 10, 1902. Serial No. 130,777. (No model.)

To all whom it may concern.-

Be it known that we, JOSEPH A. SHIELDS and JAMES W. SHIELDS, citizens of the United States, residing at Lake Linden, in the county of Houghton and State of Michigan, have invented certain new and useful Improvements in Stamp-Mills, of which the following is a specification.

This invention aims to reduce the cost incidental to the running of machinery for reducing ore to a workable state as well as to increase the output by materially lessening the time now required for inspection, repairing, and the removal of obstructing matter when the machine becomes choked.

In ore-reducing machinery of the type comprising a mortar, a stamp, an annular launder around the cavity of the mortar, and a screen between the said cavity and annular launder and composed of sections considerable difficulty and loss of time are experienced when it is required to gain access to the mortar for inspection, repairing, renewal of parts, clearing passages, or for other cause, this being due to the necessity of having to remove one or more of the screen or grate sections, which are bulky, heavy, and unwieldy. The removal and replacement of a screen-section entails loss of time, as the machine must'be shut down, and requires a number of persons in the handling, because of the weight and size.

This invention aims to obviate the aforementioned objectionable features and to enable one person to do the work and to accomplish the same in a considerably less interval of time, the invention permitting the screen-sections to be swung open and shut like a door and secured by a latch or analogous fastening when close For a full description of the invention and the merits thereof and also to acquire a knowledge of the details of construction of the means for effecting the result reference is to be had to the following description and drawings hereto attached.

While the essential and characteristic features of the invention are susceptible of modification, still the preferred embodiment of the invention is illustrated in the accompanying drawings, in which-- Figure 1 is'a top plan view of a stamp-mill embodying the invention, parts being broken away to show the screensections and the jack-screws cooperating therewith. Fig. 2 is a top view of a screen-section. Fig. 3 is a vertical transverse section of the mill onfthe line X X of Fig. 1. Fig. 4 is adetail viewof a jack-screw. Fig. 5 is a vertical transverse section on the line Y Y of Fig. 1. Fig. 6 is a front view of a screen-section or grate.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

The mortar 1 has its cavity 2 lined and surrounded by means of an annular launder 3, which is likewise lined and has its outer wall at projected above the plane of the inner wall to prevent overflow of the slimes and also to receive the end thrust of jack-screws 5, by means of which thescreen-sections are held in place at their lower ends. The roof or crown 6 is supported by means of columns 7, interposed between it and outward extensions of the mortar. The stamp 7 operates through an opening in the roof or crown and cooperates with the die 8 for crushing, comminuting, and reducing the ore. An annular shoulder 9 surrounds the cavity 2 and is located at a point between said cavity and the annular launder 3 and limits the inward movement of the screen-sections. A corresponding annular shoulder 10 is provided upon the under side of the roof orcrown 6 and limits the inward movement of the screen-sections at their upper ends. The screen is of cylindrical form and surrounds the cavity 2 of the mortar and occupies a position between said cavity and the annular launder and is preferably composed of a plurality of sections or grates, each corresponding to the space formed between adjacent columns 7. The screen-sections or grates are similarly constructed and are mounted so as to swing outward or horizontally upon one edge, so as to admit of ready access to the interior of the mill for any desired purpose. The screen-sections or grates may be of any formation, depending upon the pattern or make of the mill, and'any hinge or pivotal connection may be employed for connecting the sections to the body of the mill, so as to admit of their swinging horizontally when required. Each screen-section or grate comprises a frame 11 and a door 12, the latter being hinged at one edge to the frame and provided at its opposite edge with a latch or kindred fastening for securing the door when closed. The frames 11 are preferably of like size and extend from the roof or crown 6 to the upper side of the mortar and unitedly inclose the space circumscribing the cavity 2 when in position, as indicated most clearly in Fig. 1, the ends of adjacent frames abutting. The frames bear against the annular shoulders 9 and 10 and are held in place by the jack-screws 5 and clamp-screws 13, the latter passing through threaded openings in the roof ping of the jack-screws when in place.

or crown 6 and having their lower ends pointed and fitted into openings formed in the upper edge of the frames, said clamp-screws being held in place by jam-nuts 14:. The jackscrews 5 are of ordinary construction, and each comprises a socket 15 and a screw 16, the outer ends of the parts 15 and 16 being pointed to enter conical depressions of the frames 11 and wall 4 to prevent casual slip- The jack-screws 5 are horizontally arranged and extend over the annular launder 3, and their inner ends bear laterally against the lower ends of the frames 11, and their outer ends bear against the Wall 4, and these jack-screws, jointly with the clamp-screws 13, hold the frames 11 firmly in place and admit of said frames being removed at any time when required.

Each door of the several screen-sections or grates is substantially hinged to the frame 11 at one perpendicular edge and is adapted to swing horizontally at its opposite edge and is secured when closed by a pivoted latch 17 and catch 18, the latch being held in engagement with the catch by means of a gravitydog 19, so as to prevent accidental loosening of the latch by jar or other cause when the mill is in operation. The door 12 comprises companion frames 20 and screens or grates 21, the latter being clamped between the frames 20 by means of bolts or analogous fastenings connecting the several parts. The frame 20 comprises intermediate reinforcing-bars 22, which serve to stiffen the screens 21 and to clamp the same when in position. A splashpan 23 is arranged exterior to each door 12, and its vertical edge portions are bent inward, as shown at 24, and made fast to the vertical bars of the outermost frame 20, and the lower edge portion of the splash-pan is outwardly flared, as shown at 25, toaccommodate the slimes and direct the same into the annular launder 3.

When it is required to inspect the shoe 26 of the stamp or to make any repair or remove any obstructing matter or to renew a grate or any part of the lining of the cavity 2, it is only necessary to loosen the latch 17 or like fastening and swing the door open, and when it is required to again start the mill the door is swung to and made fast by means of the latch or like part. This operation can be quickly performed without appreciable loss of time in the stoppage of the mill and without requiring the services of more than one person. Hence the maintenance of the mill is reduced to a minimum and its operation is practicallycontinuous within working periods of time, as the stoppage for inspection or for other cause entails a lossof but a few moments, which is nothing when compared with the length of time the mill is shut, time' for inspection or repairs as generally constructed.

Having thus described the invention, what is claimed as new is 1. In astamp-mill, and in combination with the mortar, a screen surrounding the mortar and composed of sections or grates hinged at one edge and adapted to swing horizontally at the opposite edge, substantially as set forth.

2. In a stamp-mill, and in combination with the mortar, a screen surrounding the mortar and composed of sections or grates hinged at one edge and adapted to swing horizontally at the opposite edge, and means for securing the sections at their outer edges when closed, substantially as specified.

3. In a stamp-mill, the combination with the mortar, a roof or crown, and columns interposed between said roof and mortar, screensections interposed between the cavity of the mortar and said columns and hinged at one edge and swings horizontally at the opposite edge and adapted to be secured when closed, substantially as described.

4. In a stamp-mill, and in combination with the mortar, frames surrounding the cavity, and screens or grates hinged to said frames and adapted to swing horizontally, substantially as set forth.

5. In a stamp-mill, and in combination with the mortar, and a screen surrounding the cavity of the mortar and composed of hinged sections adapted to swing horizontally, and splash-pans secured at their vertical edges to the hinged screen-sections, substantially as set forth.

6. In a stamp-mill, and in combination with the mortar, and a screen surrounding the cavity of the mortar and composed of hinged sections adapted to swing horizontally, and splash-pans secured at their vertical edges to the horizontal screen sections and having their lower edge portions downwardly and outwardly flared, substantially as set forth.

7. In combination, a mortar having an annular launder surrounding the cavity and having a shoulder between the said cavity and launder, the outer wall of the latter being higher than the inner wall, a roof or crown having a shoulder corresponding to the shoulder of the mortar,-columns between the roof and mortar, frames surrounding the cavity and bearing against the shoulders of the roof and mortar, jack-screws between the lower ends of the frames and the upper portion of the outer wall of the launder, clamp-screws applied to the said roof and adapted to engage with the upper edges of the frames, screens or doors hinged to the frames at one edge and provided at the opposite edge with fastening means for securing the doors when closed, and splash-pans secured to the screendoors and covering the screen portions thereof, substantially as described.

In testimony whereof we affix our sigma tures in presence of two witnesses.

JOSEPH A. SHIELDS. JAMES W. SHIELDS.

Witnesses:

R. T. BENNALLACK, ELDRED PAULL. 

